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interfaces_wireguard.py
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interfaces_wireguard.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018-2023 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from sys import exit
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.configdict import get_interface_dict
from vyos.configdict import is_node_changed
from vyos.configverify import verify_vrf
from vyos.configverify import verify_address
from vyos.configverify import verify_bridge_delete
from vyos.configverify import verify_mtu_ipv6
from vyos.configverify import verify_mirror_redirect
from vyos.configverify import verify_bond_bridge_member
from vyos.ifconfig import WireGuardIf
from vyos.utils.kernel import check_kmod
from vyos.utils.network import check_port_availability
from vyos.utils.network import is_wireguard_key_pair
from vyos import ConfigError
from vyos import airbag
airbag.enable()
def get_config(config=None):
"""
Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
interface name will be added or a deleted flag
"""
if config:
conf = config
else:
conf = Config()
base = ['interfaces', 'wireguard']
ifname, wireguard = get_interface_dict(conf, base)
# Check if a port was changed
tmp = is_node_changed(conf, base + [ifname, 'port'])
if tmp: wireguard['port_changed'] = {}
# T4702: If anything on a peer changes we remove the peer first and re-add it
if is_node_changed(conf, base + [ifname, 'peer']):
wireguard.update({'rebuild_required': {}})
return wireguard
def verify(wireguard):
if 'deleted' in wireguard:
verify_bridge_delete(wireguard)
return None
verify_mtu_ipv6(wireguard)
verify_address(wireguard)
verify_vrf(wireguard)
verify_bond_bridge_member(wireguard)
verify_mirror_redirect(wireguard)
if 'private_key' not in wireguard:
raise ConfigError('Wireguard private-key not defined')
if 'peer' not in wireguard:
raise ConfigError('At least one Wireguard peer is required!')
if 'port' in wireguard and 'port_changed' in wireguard:
listen_port = int(wireguard['port'])
if check_port_availability('0.0.0.0', listen_port, 'udp') is not True:
raise ConfigError(f'UDP port {listen_port} is busy or unavailable and '
'cannot be used for the interface!')
# run checks on individual configured WireGuard peer
public_keys = []
for tmp in wireguard['peer']:
peer = wireguard['peer'][tmp]
if 'allowed_ips' not in peer:
raise ConfigError(f'Wireguard allowed-ips required for peer "{tmp}"!')
if 'public_key' not in peer:
raise ConfigError(f'Wireguard public-key required for peer "{tmp}"!')
if ('address' in peer and 'port' not in peer) or ('port' in peer and 'address' not in peer):
raise ConfigError('Both Wireguard port and address must be defined '
f'for peer "{tmp}" if either one of them is set!')
if peer['public_key'] in public_keys:
raise ConfigError(f'Duplicate public-key defined on peer "{tmp}"')
if 'disable' not in peer:
if is_wireguard_key_pair(wireguard['private_key'], peer['public_key']):
raise ConfigError(f'Peer "{tmp}" has the same public key as the interface "{wireguard["ifname"]}"')
public_keys.append(peer['public_key'])
def apply(wireguard):
if 'rebuild_required' in wireguard or 'deleted' in wireguard:
wg = WireGuardIf(**wireguard)
# WireGuard only supports peer removal based on the configured public-key,
# by deleting the entire interface this is the shortcut instead of parsing
# out all peers and removing them one by one.
#
# Peer reconfiguration will always come with a short downtime while the
# WireGuard interface is recreated (see below)
wg.remove()
# Create the new interface if required
if 'deleted' not in wireguard:
wg = WireGuardIf(**wireguard)
wg.update(wireguard)
return None
if __name__ == '__main__':
try:
check_kmod('wireguard')
c = get_config()
verify(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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